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Thin-film composite membranes incorporated with large-area graphene oxide sheets and adjustable surface charges

机译：薄膜复合膜掺入具有大面积的石墨烯氧化物片和可调节的表面电荷

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摘要

In this research, composite membranes were prepared by cross-linking of poly(vinyl alcohol) (PVA) and glutaraldehyde (GA) on amidoximated ultrafiltration membrane. During this procedure, it was taken advantage of large-area graphene oxide sheets as graphitic nets in the active layer. These membranes were used to remove an industrial textile dye (Chrysophenine GX) from wastewater. Optimum condition for membrane preparation was 1.5% wt. of PVA, 1.5% wt. of GA, and 0.3% wt. of graphene oxide sheets. Permeation results showed that electrostatic charges on membrane surface have easily converted from positive into negative ones. Contact angle was significantly decreased (63.5 degrees to 28.8 degrees). Final nanofiltration membrane showed lowest fouling rate during removing the industrial direct dye (flux recovery ratio: 96.60%, reversible fouling ratio: 23.82%, and irreversible fouling ratio: 3.39%). Pore size of this membrane was 8nm, and Chrysophenine GX was eliminated by 98.5% with water permeability of 12.23L/m(2).h.bar.
机译：在该研究中，通过在酰胺氧化的超滤膜上交联通过将聚（乙烯醇）（PVA）和戊二醛（Ga）交联来制备复合膜。在此过程中，利用大面积的石墨烯氧化物片作为有源层中的石墨网。这些膜用于从废水中除去工业纺织染料（Chrysophenine Gx）。膜制剂的最佳条件为1.5％wt。 PVA，1.5％wt。 Ga，0.3％wt。石墨烯氧化物片。渗透结果表明，膜表面上的静电电荷易于从阳性转化为阴性。接触角显着降低（63.5度至28.8度）。除去工业直接染料（助焊剂回收率：96.60％，可逆污垢比率：23.82％，不可逆的污垢比：3.39％），最终纳滤膜显示出最低的污垢率该膜的孔径为<8nM，并通过12.23L / m（2）.b.bar的水渗透性消除了98.5％的卷曲苯胺..bar。

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